Solar cell



FIG. 1 is a top perspective view of a solar cell according to our newdesign;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a right-side view thereof; and,

FIG. 7 is a left-side view thereof.

The broken lines shown represent the portions of the solar cell thatform no part of the claimed design.

CLAIM The ornamental design for a solar cell, as shown and described.